Area Selection
Area selection supports three modes:
- Single: Selects objects in one area at a time
- Add: Adds objects in an area to the selected set
- Sub: Subtracts objects in an area from the selected set
Area selection is most useful when you want to select multiple objects at the same time. All objects that are completely enclosed within the selection area and also pass the selection filter are selected. Area selection can also be used to partially select shapes. If partial selection is enabled, all vertices of overlapped shapes are selected.
Single Mode Area Selection
The single mode of selection is useful when you want to select a specific group of objects. It selects all completely overlapped objects (plus all overlapped vertices for partial selection) that pass the selection filter, and deselects all previously selected objects. The de-selection operation deselects all previously selected objects even if they would not pass the selection filter.
Add Mode Area Selection
The add mode of selection is identical to the single mode, except that currently selected objects remain selected. The add mode is useful when you are trying to select a group of specific objects.
Sub Mode Area Selection
The sub mode of selection is identical to the add mode, except that all completely overlapped objects (plus all overlapped vertices for partial selection) are deselected. The sub mode is useful when you want to remove specified objects from a selected set.
Interactive Function
When a selection area (l_bBox) is specified as an argument in any area selection function, SKILL uses the coordinates for that area to evaluate the function and select the enclosed objects. If you do not specify a value for l_bBox, the function behaves interactively and prompts you to enter coordinates for a selection area.
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